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Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells

✍ Scribed by M. Morales; J.J. Roa; X.G. Capdevila; M. Segarra; S. Piñol

Publisher: Elsevier Science
Year: 2010
Tongue: English
Weight: 334 KB
Volume: 58
Category: Article
ISSN: 1359-6454
DOI: 10.1016/j.actamat.2009.12.036

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✦ Synopsis

The Young's modulus (E), hardness (H) and fracture toughness (K IC ) of various compositions of gadolinia doped-ceria (GDC, Gd x Ce 1Àx O 2Àx/2 , 0.1 6 x 6 0.2) and yttria-stabilized zirconia (YSZ, Y 0.08 Zr 0.92 O 1.96 ) electrolytes were investigated by nanoindentation. All samples were produced by the sol-gel method, formed by uniaxial pressure and sintered at 1400 °C. In order to determine the mechanical properties, a Berkovich diamond tip was employed at applied loads of 5, 10, 30, 100 and 500 mN. The results were interpreted by the Oliver-Pharr method and values of K IC were determined using the method of Palmqvist cracks. The residual imprints were observed by field emission scanning electron microscopy. The results obtained showed that the H, E and K IC of GDC decreased with increasing gadolinia concentration, due to the oxygen vacancies generated by the dopant addition. As a result, the mechanical properties of GDC were significantly lower than those of YSZ electrolyte.

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